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. 2020 Jan 10;10:2983. doi: 10.3389/fmicb.2019.02983

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Copyright © 2020 Yu, Yang, Zheng, Sheng, Li, Wang, Zhang, McMinn, Zhang, Song and Chen.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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RT-qPCR analysis of the relative transcriptional levels of the genes encoding putative Asp racemase in strains SM1923 and SM1924, cultured with D-Ser as a sole nitrogen source. The recA gene was the reference gene.